Higuchi et. al, "Improved Delivery through Biological Membranes.   3. Delivery of N-Methylpyridinium-2-carbaldoxime Chloride through the Blood-Brain Barrier in Its Digydropyridine Pro-Drug Form,", 1976

Higuchi et. al, "Improved Delivery through Biological Membranes.   3. Delivery of N-Methylpyridinium-2-carbaldoxime Chloride through the Blood-Brain Barrier in Its Digydropyridine Pro-Drug Form,", 1976, Box: 10, Folder: 159. Personal papers of Takeru Higuchi, PP 359. University of Kansas. Kenneth Spencer Research Library. https://archives.lib.ku.edu/repositories/3/archival_objects/124583 Accessed December 25, 2025.